Improved machine foe qeinding saw-teeth



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IRA S. BROWN AND CHARLES N. BROWN, OF PROVIDENCE, RHODE ISLAND, ASSIGNORS TO THEMSELVES AND J. MASON GROSS, OF SAME PLACE.

Letters Patent No. 70,951, dated November 19, 1867.

IMPROVED MACHINE FOR GRINDING SAW-TEETH.

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TO ALL WHOM IT MAY CONCERN:

Be it-known that we, IRA S. BROWN and CHARLES N. BROWN, both of the city and county of Providence, in the State ofRhode Island, have invented a new and useful Improvement in Machines for Grinding Saw- Teeth; and we do hereby declare that the following specification, taken in connection with the drawings making a part of the same, is a full, clear, and exact description thereof.

Figure 1 is a side view of the machine.

Figure 2 is a top view.

The machine hereinafter described, is particularly intended to grind that variety of saw-teeth which are removable from the plate to which when in use they are secured; but it is also adapted to grind other articles having cutting edges of irregular form. Itis quite necessary that the edges of the several teeth which make up the saw, should be ground alike in all respects. Theirregularities, however, which these edges possess, make the accomplishment of this exceedingly diflicult when the operator, in manipulating the edge upon the grinding-wheel, depends solely upon the accuracy of his eye and hand. It is, besides, impracticable to make use of a pattern-guide to determine the shape which the edge shall take, after the principle employed in some mechanical grinders, on account of the great irregularities which the different varieties of teeth present, and the necessity which exists for presenting both of their sides to the grinders at almost every possible angle.

The present machine exhibits in general terms the combination of agrinding-wheel, made to revolve by any convenient and well-known means, with a vise for holding the saw-tooth, which vise is capable of being adjusted so as to present the edge of the tooth at any desired angle of inclination, means being provided for observing the different angles at which the toothis held, so thatsuccessive teeth can be ground under the same conditional .In the drawings, the grinding-wheel A, which is of emery or other suitable material, is represented as aflixed to the end of a shaft, which is hung in suitable bearings B B, supported by the standard C. Motion is given to the shaft and its grinder by means of a belt passing around the pulley D. E, fig. 2, represents one form of removable saw-tooth, the edge of which is to be ground. This tooth is held fast by the shank in a vise or clamp, F, (fig. 2,) of well-known construction. The apparatus of which the clamping-vise is a part, and whose oflice is to accommodate the edge of the tooth in any position for presentation to the grinder, is made up of various parts, as will presently be seen. The several parts of the apparatus are supported by a standard, E, (fig. 1,) whose foot-E rests upon a table projecting from the side of the standard C, which sustains the grinder, and can be clamped thereto, a graduated scale, out upon the face of the bed upon which the standard rests, enabling the operator to set the standard for successive teeth in the same position. The vise F (fig. 2) is pivoted to the arm G at the point a, around which it can be turned at will. The arm G is in turn pivoted to a block, H, which is fitted to slide between guides 6 6, while the guides themselves constitute a frame, which can be readily moved back and forth upon the two arms I I, fitted to dove-tailed channels in such frame. The arms I I are hinged at e 0, while the frame formed by such arms and the shaft 0 c, on which they hinge, is capable of being adjusted to difl'erent heights relatively to'the grinding-wheel by means of the clamp-nut d, fig. 1, and the slot e in the supporting standard E. The said frame is capable also of adjustment angularly with respect to thc-plane'of the table upon which the machine stands, the same being mounted upon a pivot,f,and can be clamped to any position within its range of movement in any convenient way. All the several joints referred to may be provided with graduated scales for the purpose of enabling the operator to observe the position at which each of the adjustable .parts of the apparatus must .be to insure the grinding of successive teeth to the same form. After the edge ofthe saw-tooth has been ground upon one of its sides, it may be reversed in the clamp when the edge upon other side may be ground with equal facility.

It willthus be seen that by the apparatus described, every positionin which it is necessary that the tooth should be held to the face of the grinding-wheel, can be obtained, and that by means of the graduated scales, combined with the different members of the apparatus, a record of the different positions may be preserved, to insure a correct repetition of the operation upon subsequent teeth. 7

What is claimed as the invention, and is desiredto be secured by Letters Patent, is-

The combination of a grinding-wheel, A, with an apparatus for holding the saw-tooth or other article to be ground, which apparatus for holding the tooth or otherarticle consists of the standard E, the hinged frame I I, and the vise F, combined therewith as described, all arranged so as to effect the presentation of the article to be ground to the wheel, substantially as described. v V

IRA. S. BROWN,

C. N. BROWN.

Witnesses:

Jomr D. THURSTON, WILLIAM W. Bremen. 

